first stab at moms if

lib/mom/instruction.rb

@@ -4,8 +4,19 @@ module Mom
   class Instruction
   end
 
+  # basically a label
+  class Noop
+    attr_reader :name
+    def initialize(name)
+      @name = name
+    end
+  end
+
+
 end
 
 require_relative "simple_call"
+require_relative "truth_check"
+require_relative "jump"
 require_relative "slot_load"
 require_relative "return_sequence"

lib/mom/jump.rb

@@ -0,0 +1,14 @@
+module Mom
+
+  # unconditional jump to the instruction given as target
+  # 
+  class Jump < Instruction
+    attr_reader :target
+
+    def initialize(target)
+      @target = target
+    end
+  end
+
+
+end

lib/mom/truth_check.rb

@@ -0,0 +1,21 @@
+module Mom
+
+  # The funny thing about the ruby truth is that is is anything but false or nil
+  #
+  # To implement the normal ruby logic, we check for false or nil and jump
+  # to the false branch. true_block follows implicitly
+  #
+  # The class only carries the blocks for analysis, and does
+  #  - NOT imply any order
+  # - will not "handle" the blocks in subsequent processing.
+  #
+  class TruthCheck < Instruction
+    attr_reader :condition , :true_block , :false_block , :merge_block
+
+    def initialize(condition , true_block , false_block , merge_block)
+      @condition , @true_block , @false_block , @merge_block = condition , true_block , false_block , merge_block
+    end
+  end
+
+
+end